Contents

An asymmetrical merger of Latin vowels, with /i/ merging with /ē/ and /e/ but /u/ merging with /ū/, sets off Eastern Romance from the symmetrical merger of /u/ with /ō/ and /o/ found in Western Romance. However, while this persists today in only a few isolated dialects in western Basilicata, such as Castelmezzano dialect, as well as Dalmatian and the Romanian languages, there is evidence that it once occurred throughout southern Italy.[2]

Several hundred years after the Roman Empire's dominance of the region, the local form of Vulgar Latin developed into Proto-Romanian, a language which had most of the features of modern Romanian. Probably due to foreign invasions (see Romania in the Dark Ages) Proto-Romanian split into four separate languages:

The Proto-Romanian branch was one of the earliest language groups to be isolated from the larger Latin family. As such, the languages contain a few words that were replaced with Germanic borrowings in Western Romance languages, for example, the word for white is derived from Latin "albus" instead of Germanic "blank".

They also share a few sound changes with the western Romance languages: some with Italian, such as [kl] > [kj] (Lat. clarus > Rom. chiar, Ital. chiaro) and also a few with Dalmatian, such as [gn] > [mn] (Lat. cognatus > Rom. cumnat, Dalm. comnut). However, most of them are original, see: Latin to Romanian sound changes.

The languages that are part of this group have some features that differentiate them from the other Romance languages, notable being the grammatical features shared within the Balkan language area as well as some semantic peculiarities, such as lume ("world") being derived from Latin lumen ("light"), inimă ("heart") being derived from Latin anima ("soul"), etc.